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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994ae03b974dbb41669c5bd3c6d0aa48b2ebd4cb1d19cf59a87f86c81b88f138' 
  AND token = 'p7JBNNEHpvd5x38T7kWYCk77OZ5BR3+958OI9VYWtcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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