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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada0de85d8edd358b04ef847c896b3b766cbdf4dce24b6db77b2f9a504904a6e' 
  AND token = 'gNcAD9tfwhaU72eRPx536enSjXY3JYWOwCnRIlG4Kxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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