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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32930f3a0b26af22edcd0a142f5a7c5c5919e6c4e0d88543bdc7102b34a8828' 
  AND token = 'V7YLJCQGAw0vwqvIXOPARu83+7kECXVRbBENPdVKkNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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