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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef6de9e6a6f29118b87f1bbc4ba7daec2a1e135a35c35ca71e1e25419b775f7' 
  AND token = 'wk8wNYxfymn1tb9L4i+4yuxfDyu9pfWuDSrHMA5cKCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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