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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f835430f0ddfe6a603f3030d2c368a220b533c3e62dfaddd614b08a79511d5' 
  AND token = 'pCs3BKMliLHQ6w8Mv2RpeoO7EoDmLWB+MWe5wPBCpkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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