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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bb532a5c428f86d690b5fc3f01b17b51a4ae62ef18f34760cd7c8514204dc8' 
  AND token = 'uAS/QIGwOrFTeN3dP8CW+9geva8WmBbbX2I+EWIBSN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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