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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53a8aa3a79b8cbfaddea8d3020c9bc5a5bfd4d63569f83973d0a2bffb938fa8' 
  AND token = 'RLnca9nuaG8ySDHuXBbMFZSpZmRfg4iW/tN/TfS+T00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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