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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '643ca60a2f50eba54e7306092a18a66e21597379620d2136dbdc2f26ef40a435' 
  AND token = 'tP/t0EEXEBMvceRqcS6/NF14NAclkf+f7moVRjZfi6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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