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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9475422904e175b81e94203d0eb5fb7b6b26907766459a9de7d4598edbe25a0' 
  AND token = 'GfsdBK1faeds0KVEDLx9q0NOc987NSMlfg1ef5sIbkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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