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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bbfb7f3137bfe5f65ab01a6fc2102dafa36b647fa427f6d3a11fbb93694059' 
  AND token = 'eTmdEw3VnLkMpVJSsmpoZfDZqRuxCYWwxyTpLnmp1TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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