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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb5b5e5873ea316f83748ce9c89972e25ab6990e5ffb4138176fbaa145151be' 
  AND token = 'uA7+knU1sRb1AwHpIQjEcC2RJPU4P22wkyUfhMy9jbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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