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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefd7542da5d8b1fe77be3ec057efebc46fcbc1b41a21ec8fc5aed4eda958736' 
  AND token = 'IkeIdkTN6pcrM0S8njQwpcjW33E4kYZTpIE+xAvvqNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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