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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e30713d20a81ade299ac1fff74673bfa6faefe9e02d451a90ae4a1f633fa1e6' 
  AND token = '3b+bnxDHxs0PJ6zguvztsoUVOdq6Yk73Y63We5NXlqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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