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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f6ce2c1191859a71e5de2708545fc0695cfe6fc1e09f45a083f67dd27b3a0c' 
  AND token = 'Dn1CxIUSa2U0jrgN3XvPClww3mi8iAQozc5Yn8iKPl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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