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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea23cd72dcec509e50a79ecfe379fdb030c1566c3d0c3a86aaf802335602f28' 
  AND token = 'zLMBVHNklxOcLh748UjdIJJe0helog5Jgs3KPlt6bZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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