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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fa577057e914b738a6d4c0dd8f5c3e42c0ddec354599b542a7f700e94f42a6' 
  AND token = '7056HQ8NsAltFekqt9WfIodGu1o4Xmajcg51Qtq0kA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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