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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f41dc776b81b5219e621137d80019c6934b35aadaf42d80c5c9d105a37134fd' 
  AND token = 'XRLLLGVFfQaI8T46W27hHdLKo72R3oEltZ2APi1f6AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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