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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00eccd103b8c7807316afa3c364aa88a0b2b905769c543b03c426ad6990328d1' 
  AND token = 'VUA1A3Nld8cqfcwl5CiDYHGCRBsZI0BGCJlggc3aQ7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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