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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897d7ed7d63361077d733f56235646669d3dde14222479b8116f4b280139cb6e' 
  AND token = 'TKN1fR7YESw7a2K8jLqz4C9HciJLsT51tPOj1Ikf1zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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