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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0e9124ff4a0da320f7b667dcf9994e30265eedb91803a263f13ff1f8d7a180' 
  AND token = 'zH9IfY3TpD2rnj4rNRXPg6rE/OYIx7O73hQnzi2YtfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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