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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca78880f354f1c050dc1442167ee323175d4befa87f893cde649d2d09b58d273' 
  AND token = 'mgxOFNBl+l14pDXKK0RW4NNSbX+foQUTR9jMVqLbGtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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