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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4e38370f53f678ffd0c712fddcb738131ec29c53e02d2078dd779b3f081c84' 
  AND token = 'U9z3UcXzyDOyDOLuDfjgRSskZFsQ2F880sza/gMptuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}