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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcad33dd5f700ed1259aa94c37bcbcb229aaeb38f35eda5a9ef02df4cab26012' 
  AND token = 'p0rM0F1034EFl+oX8QE4ddR1VTCeu8lR1Jrmh8Fk0/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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