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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff1c0f5501bbe6ef3a9f8290db60b7b25438bc0097411269312d438d6cc2f8c' 
  AND token = 'wenWAxBaHoQVr4Sb8zXZbNujyu+JWUmcNnjJfILBli8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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