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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7642c1b78bf8f14d6b1ae645b45760b010902f39132283eec81a74f180c7d18' 
  AND token = 'WA0YKa9OXctLs1PljnP6E/3Gvmf3o5gXHveyKdAKcRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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