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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e50e218e647389141e8767e17136b63b6cfa037af8a9d2c53a30748f48f7a61' 
  AND token = 'tMxeQtXT1UJfWkhv9wL5NO+ZNOPX1E8yKqa/GuloN/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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