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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7456933446b772f0b8d079ede637cae55d9eac8c3459d208dea54bb084c560' 
  AND token = '9gFEIOeMu62Z6Re0fB3AKBJB0LH8RNu4gxGpag5iA5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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