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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b0ec4b4102c45d07351e2b8a020c6ac07b367d781ec3882bdc8a131c1e28a4' 
  AND token = 'ogqjKlqzOOtMmXpoBCQI0A1DbyH5QZ4AyE9d6zECHts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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