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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc1f60521c31c5b3b39a58384886a2e224993dcffa5bc17015def1af27f44d0' 
  AND token = 'bpc4HR8XZ15aW3m8DR3W6obXTFvvxLwglXlJG0mUkJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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