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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108d07f46873c34fa1b6e9a1a542c08f7d4c939f3a466d0b1b9ae07fa0fae54d' 
  AND token = 'elCTYAb01W+jLVgxSMpYJwyaPKCPerfadlck+mdlWcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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