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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d5728872b1b063f5dd0fbbe19ca0fe736c5aa37c68fba6d0d4e43f3757b3f3' 
  AND token = 'C916BfHsKZ1gPOxNHNcYbcUHfDUoytLqD6BIIX88MWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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