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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c3fc7ba4962bbe52ac86c9ed0592c54925314b906996b939eadbc6bc96d90c' 
  AND token = 'xegQX6mahkzOmlqQBaL/XbnWM1J370eXiI02Ct/LBLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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