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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7957e0ac6a5c0d186cf22d1e19ed66574f6e431c21c9fe33c9271db50707edc2' 
  AND token = 'I2+i2nJTE+n3ipXk69VhSVLGlMsuzmFtdvA1ru6azNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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