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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9190b4aff918391511f2f8b3bd18fb8377461b16e29f50c4c7478fdfeb2c57' 
  AND token = 'pcXNKhnJhqp8nOhgNpo2GkXAAeloHXicvJiSngKsYKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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