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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88a881f1465cb76846aa2fe087606065eae5b548e9aa5263a0a86acb973253f' 
  AND token = 'gC90nIphUAfvAdbbMSYbzlPHW7wBtP5PDB4D7X+9q+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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