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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84a742a35f9aede0aaaeaed87efa04450b8ab20744bb37396efaaea2d3d332a' 
  AND token = 'z/ScLfBlWtY9Eg9oYqgJu8mVY+2n8fYE5F5yveWpPaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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