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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d050ec27124602b69041e85e35bc911768a3be3231b8ae55eb0c7be93b7e0b' 
  AND token = 'sItlrhZO2k2/SxD433/g+/Pfc7J32GvWCGXaiipYuzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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