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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b611995bf1a99840c225984fcac44e671e1a85fb7a6a36a885b6eff836ccd6' 
  AND token = 'MbK+8xsrS0hApK5tEXZ9BiQ0mzN39UEwiEMqkKG8l+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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