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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bf9622574bfe9021ff4b459ea22a7991c0a357240a36d83090aa704db3ba73' 
  AND token = 'M1SQXHBPWGMJ9HT6QXwt2ubeirMRpTuGzDUKhz4FrV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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