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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1643d4bdffcd5a7c010570fe07cb82599e6878f9857c31f3730833d73ba8c6f' 
  AND token = 'xWwqfsKKko6pGoV6Mpv2Hky4Hjno52tLqm7JBjk3mtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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