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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05791e737e9772d13ada32e27e1fb3ea93d2471ab60f4f46bf72629421e26c6' 
  AND token = 'DGHOoQG394F3mWOiNAxT2G/SsCTocXyyYfcVVfAgxTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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