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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53cea41335f1d9caec6daa259fee07e1072f8b70f52a6742f2bad4a71d558495' 
  AND token = 'OflIXGtv58kFSjWv6sigkdBa4sngqh2loDxDntSVOc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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