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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029aefa0536d9c5e4cc3a15d8d7765015a389ba41b89dc1e7c76f43893261b80' 
  AND token = '3pdRIe3RHeVCMgVWJdRJJxR+Pb3qUt3ZldvXsgIUZZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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