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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda2d862f9301ffb8414a66ae0ea4d5fbee12b0d41267b5ddb7f94121f3a63d0' 
  AND token = 'TfDe4kEU507C3dlNL1Z4G/XYu4Ld9Thx//oyhl2aJDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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