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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2db979996cc1c210ac06c1a210bfe2b99e4cf0277c0df874b38d67bab82081' 
  AND token = 'TovPv6H5aCwuTEucw74IUkdh8C/oHv0NihX8YRcaK18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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