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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047d5c3fe8b4796533f8746b1195dd55b0b972636c82a54a741158e86b503da3' 
  AND token = 'z8MaQ9C8adTVE5UTVxkIu86oUH4d4Ep+ZNgAYGHwh+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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