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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d903855757563b53d3664acaf87197e796c07945452d35327755b74899a92b' 
  AND token = 'SDDTp07qMTSLCToqxu2NLSe1v4Hk8saYZ0YrigpIaps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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