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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1e72f76bdb19976d4833cd2ae5a51d250d58c3120c5a29922023334db420d7' 
  AND token = 'cnmDLAdZiT3GKNiqQUDX9//6JlRLfIK9IxtPSQWXhy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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