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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5e7b7c621b1286063721567cd427b4b90a2665de36cc76a1f244e16efc9f95' 
  AND token = '7DV6cjyRPh79psV1RYxIKFP5uFdyhRLZhGeFbkbSVWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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