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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b593c244031efe0c91e1a8223bed1750f6a48507702e11eeacb714c0211027' 
  AND token = '0TTLV3Ui3ufCl9mGh7sn0o2WT58f7r96BBCyo/hgLW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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