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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f1080fe41e4af2d0c74e357f2b674b421977557edf3472d50d501248b59033' 
  AND token = '3c46OPznzU4hVmxxoQ1Kl2dx+lHiD3yT6OlT/aZbn1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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