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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5518093bbd558794307296f1f1df3caa263e67cde5b92908458d1eb7517ede' 
  AND token = 'iLagGjFYmEvbfu+sbT8DU4/rW8pGwA9Q7sYpEXkdmL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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