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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306e6e28853ac7a088b5342afa1259a1dfc63b7403dafc87d5a3dcb907e80ae7' 
  AND token = 'icoqkM9PhSyE4CoRPVe3wEaVctc6T90PrQQaP6Eh/mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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