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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bb0483a6d32ee6f07ae012034dd2453d640c56757947e663d270f93e897fc6' 
  AND token = 'K4zRyRCc2QVhL6Jg+yS5sxrlHC6XZLCxeV7z0gLe9rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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