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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246c530a68af80b3615878115980d71dbad531b625d87846395c39fef9e6b3bd' 
  AND token = '7olpHByoIgaDEgwNEPJ3tcs90b5o9Ue/eyizfMmT+Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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