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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd113484b4a55089f41c424bbf08f44d9d358f81b81a47a08d3ec52dd0aefe68' 
  AND token = '5md1ijfDADzVMkU03GkZihqBjbsyg5e+E51+Jvz8WYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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