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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143bdd212a91f384c5d12efcdc78942d5c0aa8c1ac902afbedf503bd90a86cbc' 
  AND token = 'YKDXjqKEt50HThlj8zfux2Q9nKATPBKaa3A/+dij+kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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