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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be31b8f3e41325ce94e3e334174773e7662fa28ea698458e5094d7dc166f4093' 
  AND token = 'OKiXgWsZ4dY/nzNr5O4d+vBETUU1Q6/gmZz6WA1YBAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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