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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d138276a3330346c77f51f999ea05809c31caba756308c7e8e80cd174fe495' 
  AND token = 'AUg+SvObJ7eqdTDAyXdTIhVs/gTbUW299xu/nppbaG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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