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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37eb7d9a5fdf5d2647df993c7d7b1a2610ffaa3dd5a3b31f57d21fb3a5e75e1' 
  AND token = '6bUToo7UmyfPlnu7Q1UecXG1mgomiOX0YyLi+xB0UAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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